Exhaust deflector



July 27 9 1926.

EXHAUST DEFLECTOR Filed July 15, 1925 2 Sheets-Sheet 1 if J R T ll if JI a i 64 In, I

JNVENTOR. madam Zimmevmwn fl/SATTO NEY 1,594,232 w. F. ZIMMERMANN 1 942w. F. ZIMMERMANN 32 EXHAUST DEFLECTOR Filed July 15, 1925 2 Sheets-Sheet2 T If INVENTOR. 112311101111 Zimmfi'manl;

15 A NEYS.

Patented July 27, 1926.

NETE

WILLIAM FRANK ZIMIlEEItIIIANN, OF WAVEELTZ', NEW ASSIGNOBJ T0 TIEGER-SOLL-RAND COMPANY, OF JERSEY CTTY, NET-V JERSEEY, A CORPORATION OF NETVJERSEY.

EXHAUST DEFLECTOR.

Application filed July 15,

This invention relates to pneumatic hammer tools, but more particularlyto the exhaust deflector disclosed in my co-pending application, SerialNo. 18,656, filed March 27, 1925 for a pneumatic chipping hammer. Theobjects of the present invention are to improve upon the means fordeflecting the exhaust from pneumatic tools and enable the exhaustdeflector to be located between the cylinder and handle of the machine,but in a convenient and protected po sition.

The invention is illustrated in one of its preferred forms in theaccompanying drawings, in which- Figu e 1 is a side elevation partlybrohen away and in vertical section showing a chipping hammer providedwith the exhaust de flector,

Figure 2 is a detail perspective view of the exhaust deflector, and

Figures 3 and 4 are diagrammatic longitudinal sectional viewsillustrating the operation of the machine.

Referring to the drawings, the cylinder or barrel A is formed with thebore 13 for the reciprocating hammer piston C having the neck D. Blowsof impact are imparted to the chisel or tool E located at the front.

end of the cylinder. The rearward portion of the cylinder is providedwith an enlarged bore F to receive the valve box G in the form of ahollow block, and also to receive the forward valve box cap H and therearward valve box cap J. The handle K having the handle grip L issuitably secured to the barrel as by means of the bolts (l. The handlegrip contains the throttle valve (not shown) controlled by the latch Pfor supplying pressure fluid to the machine.

The pressure fluid actuated distribution valve Q may be of any suitabletype but is shown of the differential type and is located in the valvebox G with its axis longitudinal. Pressure fluid is supplied to themachine from the supply passage R in the handle L and a main exhaust Sis provided for the machine at a point located rearwardly of the valve.This main exhaust is conveniently located in the rearward valve box capJ and an exhaust deflector T i provided for this main exhaust betweenthe handie and cylinder. The exhaust deflector T 1925. Serial No.43,705.

as shown in Figure 2 is in the form of a sp it ring open at one side at3 and the edges of the ring are preferably turned at an angle to termflanges 4;, so that the ring is of trough shape for conducting theexhaust to atmosphere through the space or opening left oetween thecylinder and back head indicated in Figure l. A portion of one flange,preferably opposite the open portion 3 is cut to form a tongue 5 whichcooperates with notches 8 in the barrel for holding the deflector in agiven adjusted radial position on a portion of the valve box, withreference to the longitudinal axis of the cylinder. The deflector issecurely positioned between the cylinder and handle and is protected andnot subject to derangement or loss.

The radius of the flllet 6 of the counter-- bore of the handle K isgreater than the radiusof the corner 7 of the deflector T, so that whenthe handle is tightened to the barrel, the smaller radius 7 rides up onthe fillet 6 and the deflector T is gripped and held in position by thismeans.

The supply of pressure fluid to both ends of the cylinder is controlledby the valve, and the main exhaust from the forward end of the cylinderthrough the exhaust passage lil is controlled by the piston G, and inaddition to this main exhaust an auxiliary exliaust is provided from thefront end of the cylinder through the passage V controlled by the valveQ. The exhaust from the rear end of the cylinder through the port TVpasses through the valve Q itself to the main exhaust S and iscontrolled by the valve.

I The valve is thrown forward and held in forward position by live fluidpressure acting upon the shoulder of the enlarged head i of the valve,and the valve thrown to rearward position and held in said 1005i tion bylive pressure fluid acting against the valve in a rearward direction andcontrolled by the neck D of the piston which co perates with the passageX in the cylinder.

The differential valve Q which is one type of valve which has beensuccessfully used is preferably formed with the enlarged head Y and theneck Z, and the valve has an open rearward end a The enlarged head YT011115? rearward shoulder hen the valve around the neck Z. and fromthence to the rearward end of the cylinder through the 73 ports andpassa es indicated for driving the piston forwar 'ihe rearwardly actingc of the enlarged head of to atmospheric presr in its forward posi-Figure 3 through the .'haus of the pist n and I: to the rearvvardly thevalve will be actuheld in rearward posiion owing to tl e fact that thearea 0 is argcr than the area b.

In the operation cit-the chipping hammer, let it be assumed that thepiston is in its rear-most position as indicated in Figure 8 and thevalve is in its forward position in which case live pressure luidadmitted from the passage It in the handle will pass through therearward valve box: cap J and through passages in the valve box aroundthe neck Z of 12 valve and through a passage in tl forward valve box capand the port W to the rearward end ofthe cylinder which will drive thepiston forward. At the timethat the edge (Z at the front end of thepiston covers the port 6 of the passage X. the dge 7 of the neck D willhave uncovered the port 9 of the live pressure fluid supp passage T sothat pressure fluid will flow around the neck I) of the piston andthrough the port it in the side of the cylinder con'nnunicating with thepassage X leading to the'forward end of the valve so that the valve isthen thrown rearwardly due to the differential areas of the valve.

As the valve is thrown rearwardly, live an fluid is supplied from thesupply pa ll in the handle around the neck Z of the valve and throughthe supply passage V to the front end of the cylinder. -The piston,however, has sullicient momentum to strike its blow upon the chiselshank I 1 and commences its rearward motion before the pressure beginsto build up in front of the piston to drive it rearwardly. This positionof the parts is shown in Figure at. The rearward motion of the piston isdue both to rebound and to live pressure fluid admitted as described.

Dur ng the rearward travel of the piston when 1e edge at the forward endofthe piston uncoversthe port 6 of thepassag the exhaust 12.5

and the port j of the exhaust passage U, the edge 7 of the piston neckwill have covered the ports g and it thus closing off the supply of livep"essure fluid to the rearwardl acting PIQSSLI'Q surface 0 of the valveand the forward end of the valve will thus be open to exhaust hrough thepassage X and 1 age U. At this time the ssure 'iuid on the forwardlyacting face 5 of the valve head or shoulder will hrow the valveforwardly to the position indicated in Figure 3 and open y exhaust forthe front end of Yer through tlc passage V and over the rearward end ofthe valve to the main exhaust S. Before this occurs howtie exhaust fromthe rein'wz d end of he cylinder as the piston traveling rearl passesout through the port W and der, an exhaust deflector in said counterborein the form of a split rin open at one side the edges of the ring beingbent inwardly at an angle the radius of the fillet of the counterborebeing greater than the radius of the bend of the cooperating corner ofthe deflector, whereby the deflector is gripped tightly in thecounter-bore when the handle is tigl'itened to the cylinder.

2. In a pneumatic hammer tool, the combination of a cylinder andreciprocating piston, a handle having a fineted counterbore, means forconnecting the handle to the cylinder, an exhaust deflect r in saidcounterbore in the-form of a split ring open at one side, the edges ofthe ring being bent inwardly at an angl the radius of the fillet of thecount-erbore being greater than the radius of the bend of thecooperating corner of specification.

WILLIAM- FRANK ZIMMERMANN.

